From Calvert - The molds are machined from aluminum billets, finished to a mirror surface and covered in nickel to provide a long lasting surface.

Carbon has a very low (actually negative) rate of thermal expansion. The blades are to be of carbon and it is probable that heat will be used in the cure. This means that it might be necessary, if possible, to make the female mold out of carbon also. Consider embedding carbon tubes in this mold for the transfer of heat and/or pressure? How well does carbon transfer heat?